Mossyrock DamOn US 12 6 miles west of Morton and 3 miles east of Mossyrock. Tacoma Power boondock area on the lake shore with porta-potties. Park to the east of the paved lot. State: Washington City: Morton Nearest Town: Mossyrock Status; Official Cost: Free Nearest Road: Paved Scenery Rating: 3 Months Opened: Year Round Extras: Water Number of Camp Sites: 10 or less Max Stay : Unknown -